Lee Da Il, a private investigator, teams up with Jung Yeo Wool, his assistant, to solve a mystery connected to the death of her younger sibling. They collaborate to unravel other enigmatic crimes.
Failing detectives Da Il and Sang Seob are tasked with finding a lost child, plunging them into an increasingly peculiar case.
Da Il suspects a teacher as the kidnapper; amidst the investigation, tragedy strikes him unexpectedly.
Yeo Wool, baffled by Da Il's disappearance and the peculiarities surrounding the case, persists in her search for him.
Seeking insight, Da Il visits Yeo Wool; their conversation reveals clues about a mysterious woman.
After a distressing incident at Yi Rang's former restaurant, Da Il sympathizes with Yeo Wool, warning of a woman in red.
Yi Rang's hearing aid inspires Da Il to investigate the woman in red further; the principal of a pre-school is the next target.
To hunt the woman in red, Da Il seeks Sang Seob's help, revealing a grave secret to a skeptical Sang Seob.
Discovering Da Il's ID tag, Sang Seob acknowledges Da Il's fate, joining him and Yeo Wool in their pursuit; a threat looms from the woman in red.
The woman in red threatens Da Il's loved ones, with Sang Seob becoming her next target, prompting Da Il to intervene.
Learning of a deceased police officer connected to Sang Seob, Da Il senses danger closing in and races against time.
The team races to find the elusive Sunwoo Hye at a hospital, guided by her nurse, Jeon Deok Joong.
Da Il and Yeo Wool consult a shaman for guidance, resulting in a dangerous adventure and critical decisions.
Da Il stabs Hye, triggering a series of horrific events that Yeo Wool blames on herself.
Accused due to her fingerprints, Yeo Wool struggles between truth and Da Il's counsel, as they gather more evidence.
The team strategizes as Sunwoo Hye gains mobility, while Da Il interrogates Deok Joong.
As Sunwoo Hye plots mass murder, Da Il revisits past information to stop her.
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